(a)[2]
Explain what is meant by the root-mean-square (r.m.s.) value of an alternating voltage.
(b(i))[1]
An alternating voltage $V$ is represented by $V = 220\sin(120\pi t)$, with $V$ measured in volts and $t$ measured in seconds. Determine the peak voltage.
(b(ii))[1]
An alternating voltage $V$ is represented by $V = 220\sin(120\pi t)$. Determine the r.m.s. voltage.
(b(iii))[1]
An alternating voltage $V$ is represented by $V = 220\sin(120\pi t)$. Determine the frequency.
(c)[2]
The alternating voltage in (b) is connected across a resistor so that the mean power output from the resistor is $1.5\,\text{kW}$. Calculate the resistance of the resistor.